OK, im setting up a new 75 gallon tank and this is sump i have had for years that has not been in use. I got out of the hobby for a while. Anyway you can see the dimensions on the sump and chambers. I'm not going to have a skimmer at this time because im going to do a 6 week cycle the right way. I want a fuge in the sump but i can tell where the water should come in and where the fuge should be along with return pump.Please enlighten me on how to get this all pumped up the right way. Thanks